Driving mechanism for rotary valves.



G. E. MEAD.

DRIVING MECHANISM FOR ROTARY VALVES.

APPLICATION I'ILED MAIL'I, 1912.

Patented Mar. 9, 1915.

THE NORRIS PETERS CID" PHOWLITHOU WASHINGWN, D. C.

7 r7 rm 1|:

CYRUS E. MEAD, or DAYTON, OHIO, ASSIGNOR To THE MEAD ENGINE COMPANY, OF DAYTON, OHIO, A CORPORATION or onro.

DRIVING MEOHAN ISM FOR ROTARY VALVES.

Specification of Letters Patent.

Patented Mar. 9, 191 5.

Applicationfiled March 7, 1912. Serial No. 682,313.

To all whom it may concern:

Be it known that. I, CYRUS E. MEAD, a citizen of the United States, residing at Dayton, in thecounty of Montgomery and State of Ohio, have invented certain new and useful Improvements in Driving Mechanism for Rotary Valves, of which the following is a specification, reference being had therein to the accompanying drawing.

This invention'relates to driving mechanism for rotary valves, and the object of the invention is to provide a drive for a rotary valve which will permit of the slowing down or stopping of the rotation of the valve without injury to the driving mechanism or the partsconnected therewith.

It is also; an object of theinvention to provide such a connection which will permit one valve to slow down or stop without interfering with the movement of the other valve and without destroying the relative adjustment of the two valves. I

In the accompanying drawings, Figure 1 is an elevation of a driving mechanism embodying my invention; and Fig. 2 is asection taken vertically through Fig. 1.

In these drawings I have illustrated one embodiment of my invention and have shown the same as applied to a, driving mechanism similar to that shown and described in the application for patent filed by me J any. 22, 1912, Serial Number 672,605, but it will be understood thatthe invention is not to be limited to this particular type of driving mechanism. This driving mechanism is shown as applied to one of the valves of a rotary valve engine, portions of which are indicated bythe reference numeral 1. The valve, which is indicated at 2, is formed in two parts and the driving mechanism is arranged between the two parts of the valve. Any suitable driving member may be employed for imparting rotary movement to the valves. In the present instance I have employed a sprocket wheel 3 for this purpose. This sprocket wheel may be rotated from any suitable source of power but is preferably driven either directly or indirectly. from the crank shaft of the engine. The driving member is preferably mounted independently of the valve so as to relieve the valve of all thrust and permit the same to have movement relatively to the driving member. To this end ahollow stud 4 is mounted on the engine andthe driving member 3 is provided with a hub 5 which is rotatably mounted on the hollow stud 4:. In the present instance antifriction rollers 6 are interposed between the hub and the stud, and the hub and rollers are held against longitudinal movementby means of a flange 7 having a screw-threaded boss 8 which enters the hol low stud at. Extending into the hollow stud 4 and free to rotate therein is a connecting member, such as a sleeve 9, which is connected with the rotary member and the driving member. The cross sectional shape of the interior of the sleeve 9 isnon-circular and the two parts of the valve are each pro,- vided with arstem 10 of a cross sectional shape similar to that of the hollow stud, thus enabling the valve sections to have longitudinal movement relatively to the con necting member but causing the same to rotate in unison with the connecting member.

The connection between the connecting T arms 11 and the driving, member has curved slots-12 arranged adjacent to the apertures in the respective arms. Bolts 13 extend through the apertured arms 11 and through the slots 12 in the driving member, and, by shifting these bolts the points of connection of the arms to the driving member may be varied and the desired adjustment of the valve secured.

So much of the apparatus as has thus far been described is substantially similar to that shown and described in the above mentioned application. The present invention 7 consists in making the connection between the sleeve 9 and the driving member a yielding one, whereby any interference with the rotation of the valve will not result in the injury of the driving mechanism or any of the parts connected therewith. To accomplish this I have provided the bolts 13 with apertured heads 14. Mounted on the driving member at points removed from the slots and on a radius substantially the same as the radius of the slots are apertured lugs 15 having mounted therein curved rods 16, which rods extend through the apertured heads of the respective bolts 13. A spring 17 confined between the lugs 15 and the I opposite the fixed ment of the valve heads of the bolts 13 tends to move the bolts and, consequently, the arms '11 of the sleeve j 9, toward'those' ends of the respective slots of the arms is limited by means ofnuts. 18

secured onto the ends of the rods and in this: manner the. sleeve; is adjustable relathe driving member and an adjustmay be secured. The tentiv ely to sion of the spring sleeve 9"in a fixed relation to the-driving j ustment of the memberv during the ordinary operation of the valve,thus preserving the relative. ad-

two Ivalves-and insuring the proper timing thereof. If any unusual re.

sistance should be ofiered to the rotation of sistance will cause the springs 17 to be comwith the rotapEressed without interfering The slowing tion" of thedriving member.

down orstopping of the valvewill, however, throw the same out of time and result in the stopping of the engine due to the fact I that the valves are not, properly timed. The

- adjustment of the valve is'not, however, in

terfered with and the instant the obstruction or resistance is removed the valve will resume its'normal position and in this posi-v tion it will befproperly timed with relation 7 to the other valve.

the valveis not entirely checked and the re- Often the rotation of sistance is but ofa momentary character.

' In such case .the'timing of the valves will i be automatically adjusted as; soon as the resistance has been removed and th-e valveis free to rotate in a normal manner; Whether the checking of the valve is merelyv momentary or the engine 'is-brought to an entire stop-'the resiliency of the connection between the valve and the driving member'will pre vent injury to the driving 'IIlBCllELIllSIIL' While I have shown and described one embodiment of the: invention it will be understood that this has been chosen forthe purposes of illustration only andthatI do lug 15. This movement in the art.

17 is sufficient to hold the apertured head, anda spring con not desire to be limited to the details of con struction' shown and described,,for obvious modifications willf occur to a'p'erson skilled Having thus,

' tion, what I claim as new and desire to secure by ;Lette rs Patent, is 2- 1. The combination, with a rotary valve having a stem, ofladrivlng member'having a curved slot therein mounted independently of said valve and adapted to-rotate about an" aXis substantially coincident, with, the axis of said valve, of "a sleeve to receive said valveastem and to rotate in unison therewith, an armcarried by said extendingthrough said arm and through the slot in said'driving member, said bolt having an apertured head, a curved rod mounted on said. driving member, extending sleeve, a'bolt fully described my inven-v V throughthe apertured head of said bolt and 3' having a stop at a point remote from said fined. between theapertured head of said bolt and said stop.

2'. The. combination, withjaf rotary valve having a stem-,of a driving member having a curved slot v ently of said valve". and adaptedto rotate about an axissubstantially coincident" with the axis ofsaid valve, of-a sleeveto receive said valve stem. and to rotate in unison therewith, an arm carried by said sleeve, a bolt extending through] said arm and through the slot'in said driving member,

therein mounted independ- I saidbolthaving anapertured head, a curved rod mounted onsaid driving member, ex-

tending through-the apertured head-of said boltand havingja stop at a pointaremote from said apertured' head, a spring'confined between the apertured head of said bolt and said stop, andfadjustab le means for'li'mitin'g the movement ofsaid bolt with relation to i said i rod.

In testimony'whereof, I 'signa 'ture inpresence of two witnesses.

CYRUS Witnesses TV'ILLIAM liilh'r'rnnws Hamnnrr L. HAMMAKER;

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